Calculating combinations of a key

I want to protect accounds by introducing a key, and I need to calculate the potential combinations
so that I am happy with the amount of potential combinations.
I will use numbers 0-9 and characters A to Z .. so 36 characters in each column.
Example: 65TG9
Does anybody know where I might find an online calculator that I can use to check the number of combinations?
I need to let it know there are 36 characters, and then test the length of the string to get it up to a big enough number. I'm just trying to stop overkill, no point having a huge UUID if I don't need it
Thanks
Mark

Its been a while since my last math class, but I'm pretty sure that the equation for testing the possible permutations here would be:
(# of unique characters in the set)^(# of positions)
e.g.
2 characters with 2 positions = 2^2 = 4
2 characters with 3 positions = 2^3 = 8
with 36 characters, you can go a long way with only a few positions. quick suggestion though - the times that we've implemented this sort of random character string generator, its always a good idea to leave out certain... shall we say... naughty... letters out of the mix to prevent any user from being assigned a randomly generated obscene key.
Now THAT is probably a fairly fun math probelm to solve right there.
Obviously not an issue if you are using the key as part of an encrypted/encoded token that no one will ever see but the server.

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Hi Friends,
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Hi..
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SALES ORDER    ITEM                MATERIAL            DATE1                         DATE2
101                        Item1               Mat1              01/01/2010                15/01/2010
101                        Item2               Mat2              01/01/2010                15/01/2010
101                       Item3                Mat3             01/01/2010                15/01/2010
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101                        01/01/2010                15/01/2010                14
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101                        Item2               Mat2              01/01/2010                15/01/2010
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I have Sales Schedule data( DSO ) and Delivery Item data( DSO ). I would like to combine this two DSO into one new DSO in order to get the Open Order Quantity ( Order Quantity - Delivery Quantiy ).
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